Arithmetic and control unit



FIG. 1 is a front elevational vieww of an arithmetic and control unit showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof;

Portions of FIG. 2 that are shown as broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an arithmetic and control unit, as shown and described. 